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Published on: December 8, 2011
Experimental cutaneous candidiasis in rodents
Abstract:
Epicutaneous application of viable Candida albicans or Candida stellatoidea under an occlusive dressing resulted in subcorneal microabscesses in newborn rats and mice. Neither heat-killed C. albicans nor occlusion alone resulted in epidermal micropustules. These results were dependent upon the number of organisms applied and the duration of application. Four additional species of Candida tested did not produce epidermal micropustules. The microscopic pathology of the abscesses revealed penetration of the epidermis by Candida pseudohyphae; the tips of the hyphal processes were seen within the pustules when sections were stained by the periodic acid-Schiff method. The resident flora of the newborn mouse or rat was not substantially altered by occlusion with or without C. albicans during the interval tested. The animal model of cutaneous candidiasis with permit greater manipulation and control in investigations of cutaneous candidiasis and the factors influencing neutrophil accumulation in the epidermis.
Insights
Viable Candida albicans applied to newborn rodent skin caused microabscesses, demonstrating a new animal model for cutaneous candidiasis research. This model helps study fungal infections and neutrophil responses.
Area of Science:
- Mycology
- Dermatology
- Immunology
Background:
- Cutaneous candidiasis is a common fungal infection.
- Understanding the pathogenesis of skin infections is crucial.
- Existing models may lack specific features for studying Candida skin infections.
Purpose of the Study:
- To develop and characterize a novel animal model for cutaneous candidiasis.
- To investigate the role of viable Candida species in inducing skin lesions.
- To establish a controllable model for studying host responses to fungal skin pathogens.
Main Methods:
- Epicutaneous application of viable Candida albicans and Candida stellatoidea to newborn rats and mice under occlusion.
- Evaluation of epidermal micropustules and subcorneal microabscesses.
- Microscopic examination using periodic acid-Schiff staining to identify Candida pseudohyphae.
Main Results:
- Viable Candida albicans and C. stellatoidea induced subcorneal microabscesses in newborn rodents.
- Heat-killed Candida or occlusion alone did not cause micropustules.
- Lesion formation was dependent on the number of organisms and duration of application.
- Candida pseudohyphae were observed penetrating the epidermis.
Conclusions:
- A reproducible animal model for cutaneous candidiasis was established using viable Candida species.
- This model allows for controlled investigation of fungal skin infections.
- The model is suitable for studying factors influencing neutrophil accumulation in the epidermis during candidiasis.
